.center {
    text-align: center
}

.logon-btn {
    width: 150px;
    height: 50px;
    font-size: larger;
}

.tips-bg {
    position: relative;
    width: 100%;
    background-image: url(/img/bg-img/tips.jfif);
    text-align: center;
    color: aliceblue;
    z-index: 1;
}

.tips-bg:after {
    position: absolute;
    width: 100%;
    height: 100%;
    background-color: rgba(4, 8, 29, 0.3);
    content: '';
    top: 0;
    left: 0;
    z-index: -1;
}

.tips-content {
    position: relative;
    font-size: 28px;
    font-weight: bold;
}

.profile-photo-title {
    width: 120px;
    border-radius: 50%;
}

.profile-title {
    padding-top: 30px;
    font-size: 30px;
    color: aliceblue;
}